<!--
 * @Author: Dagon
 * @Date: 2021-03-06 20:35:39
 * @Description: 
-->
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style>
    * {
      margin: 0;
      padding: 0;
    }

    .wrap {
      width: 20%;
    }

    .box {
      background-color: pink;
    }

    .box p {
      width: 100%;
      height: 100%;
      position: absolute;
      background-color: aqua;
      color: #666;
    }
  </style>
  <title>Document</title>
</head>

<body>
  <div class="wrap">
    <divn class="box">
      <p>13</p>
    </divn>
  </div>
</body>

</html>